Protactinium
Atomic No:
91
Name:
Protactinium  [̩prəʊtæk'tɪniəm]
Formula:
Pa
Molar Mass:
231.0359

Protactinium element has 91 protons, 140 neutrons and 91 electrons. Protactinium is a silvery gray metal at room temperature. The melting point of Protactinium metal is 1568 ̊C. It's radioactive. Protactinium cations include Pa+5, Pa+4, Pa+3 and Pa+2.

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